Hi Max...
I have listed my Lowepro Pro Trekker and Photo Trekker for sale in the Marketplace.
I did so, because I found an adventure backpack I really, really, really, like:
The F-stop Gear Loka with all three ICU's (Internal Camera Units) plus a hydration sleeve (You purchase whatever hydration system you prefer.).
If you would go to the Dan Carr Photography website:
F-Stop Loka photo packpack and new ICUs – photo showcase » Dan Carr Photography - Photography Product Reviews + Ski, Snowboard and adventure photography tips
you will find Mr Carr's review and a ton (tonne in Australia?) of photos of this backpack system.
If you find this one too small, you will also find Mr Carr's reviews/photos of the Tilopa and Satori.
As soon as my backpack ads need a bump, I will post about the Loka so potential purchasers of my Lowepro backpacks will choose what is best for them.
RayGunn